U.S. patent number 5,863,226 [Application Number 08/711,899] was granted by the patent office on 1999-01-26 for connector for coaxial cable.
Invention is credited to Cheng Sun Lan, Shen-Chia Wong.
United States Patent |
5,863,226 |
Lan , et al. |
January 26, 1999 |
Connector for coaxial cable
Abstract
A connector for coaxial cable, including a main body formed with
an inner passage in which a pair of insulative sleeves are fitted.
Each insulative sleeve is disposed with a small diameter section. A
tubular contact member is fitted between the small diameter
sections of the two insulative sleeves. The contact member is made
of a sheet material by means of curling. Two ends of the contact
member are not adjoined together so as to define a narrow slit. An
opposite side of the slit is also formed with two slits which are
not adjacent to each other so that when a core with 1.2 to 1.3 mm
diameter is inserted into the contact member, the contact member is
stretched open to achieve greater resilience.
Inventors: |
Lan; Cheng Sun (Peito District,
Taipei, TW), Wong; Shen-Chia (Peito District, Taipei,
TW) |
Family
ID: |
46253137 |
Appl.
No.: |
08/711,899 |
Filed: |
September 12, 1996 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
Issue Date |
|
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579214 |
Dec 28, 1995 |
5667409 |
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Current U.S.
Class: |
439/852; 439/654;
439/578 |
Current CPC
Class: |
H01R
9/0503 (20130101); H01R 24/542 (20130101); H01R
2103/00 (20130101) |
Current International
Class: |
H01R
13/646 (20060101); H01R 9/05 (20060101); H01R
13/00 (20060101); H01R 011/22 () |
Field of
Search: |
;439/575,578,651,654,655,675,852 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Bradley; Paula
Assistant Examiner: Ta; Tho Dac
Attorney, Agent or Firm: Pro-Techtor International
Services
Parent Case Text
CROSS-REFERENCE OF THE APPLICATION
The present application is a continue-in-part application of U.S.
patent application Ser. No. 08/579,214 which is now U.S. Pat. No.
5,667,409, filed Dec. 28, 1995.
Claims
What is claimed is:
1. A connector for coaxial cable comprising:
a main body with an inner passage,
a pair of insulating sleeves fitted inside said inner passage, an
outer end face of each insulating sleeve includes a small diameter
section,
a tubular contact member being fitted between said small diameter
sections of said insulating sleeves, each end of said contact
member includes at least two rectangular holes on upper and lower
sides respectively, each rectangular hole includes a lower side
formed by an inward extending inclined section of said contact
member, said inclined section includes at an inner end thereof an
arch section; wherein
said contact member is formed from a single sheet of material
rolled into a tubular body, ends of said contact member are not
joined so that a narrow first slit is defined between said ends,
said contact member includes a second slit on a side of said
contact member opposite said first slit, said second slit does not
extend the entire length of said contact member so that said
contact member remains a single piece, said first slit and said
second slit allow expansion of said contact member.
2. The connector as claimed in claim 1 wherein:
said small diameter section of said insulating sleeve includes a
plurality of slits.
3. A connector as claimed in claim 1, wherein the insulative sleeve
has a short structure.
4. A connector as claimed in claim 1, wherein at least two
rectangular holes are punched on each end of the contact
member.
5. A connector as claimed in claim 1, wherein the insulative sleeve
is made of rubber material and formed with a central recess on
outer end face, the insulative sleeve being further formed with a
coaxial insertion hole for the contact member to fit therein, a
membrane being disposed between the central recess and the
insertion hole for achieving a better waterproof effect for the
interior of the connector and increasing the strength of the
contact member.
6. A connector as claimed in claim 5, wherein an annular projection
is disposed on outer circumference of the insulative sleeve for
achieving double waterproof effect.
Description
BACKGROUND OF THE INVENTION
The present invention relates to an improved connector for coaxial
cable in which a tubular contact member and an insulative sleeve
are connected with each other for reducing back loss of the
electrical appliance. The connector is suitable for coaxial cables
with different specifications.
U.S. patent application Ser. No. 08/579,214 provides a connector
for improving the conventional connector for coaxial cable used in
the existing cable TV system, closed-circuit TV system and common
antenna TV system. The conventional connector includes internal
flat contact plate and insulative member. When the core of the
cable is inserted into the connector, the core contacts with the
contact plate only at an upper and a lower points with poor
contacting effect so that the back loss of the electrical appliance
is greater and the requirement of high frequency cannot be
satisfied. Especially, when the cable TV is connected with a
telephone, the cable needs to receive the input signal (such as the
selected TV program and TV purchase item) from the TV end as well
as provide the current for the telephone ring sound simultaneously.
At this time, the core of the cable bears greater current. With
respect to the contacting point of the conventional connector, when
greater current passes therethrough, the poor contact will result
in sparks. This makes the transmitted signal and current unable to
effectively pass through the contact point. Accordingly, the
quality of the telephone transmission cannot be accurately
controlled.
In order to solve the above problem, U.S. patent application Ser.
No. 08/579,214 provides a cylindrical contact member instead of the
flat contact member for eliminating the problems of impedance
coupling in high frequency and the compatibility of different
cables so as to achieve better contacting effect, permitting
greater current to pass through the connector.
However, in use, it is found that when a core with over 1.2 mm
diameter is inserted into the tubular contact member, the.contact
member is subject to failure of resilience. Moreover, the
plastic-made insulative sleeve has poor waterproof effect.
SUMMARY OF THE INVENTION
It is therefore a primary object of the present invention to
provide an improved connector for coaxial cable, in which the
tubular contact member is made of a sheet material by means of
curling. Two ends. of the contact member are not adjoined together
so as to define a narrow slit. An opposite side of the slit is also
formed with two slits which are not adjacent to each other so that
a core with over 1.2 mm diameter is suitable for the contact member
without failure of resilience of the material and with greater
resilience.
It is a further object of the present invention to provide the
above connector in which the insulative sleeve has a short
structure for greatly enhancing the electrical property and reduce
back loss of the electrical appliance.
It is still a further object of the present invention to. provide
the above connector in which the small diameter section of the
insulative sleeve is formed with several slits, permitting the
small diameter section to expand so as to increase contacting
effect and reduce contacting impedance.
The present invention can be best understood through the following
description and accompanying drawing, wherein:
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a perspective assembled view of a first embodiment of the
present invention;
FIG. 2 is a perspective exploded view according to FIG. 1;
FIG. 3 is a perspective exploded view of a second embodiment of the
present invention;
FIG. 4 is a sectional view according to FIG. 3;
FIG. 5 is a sectional view of a third embodiment of the insulative
sleeve of the present invention;
FIG. 6 is a perspective view of a fourth embodiment of the contact
member of the present invention;
FIG. 6A is a right side view according to FIG. 6;
FIG. 6B is a sectional view taken along line 6A--6A of FIG. 6;
FIG. 7A shows that a core with less diameter is inserted into the
arch sections of the contact member of the present invention;
FIG. 7B shows that a core with larger diameter is inserted into the
arch sections of the contact member of the present invention;
and
FIG. 8 is a sectional view showing that each end of the contact
member is punched with three rectangular holes.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
Please refer to FIGS. 1 and 2. The connector of the present
invention includes a main body 40 having a nut section 43 at middle
portion of outer surface and two thread sections 41, 42 on two
sides of the nut section 43. The main body 40 is formed with an
inner passage 44 in which a pair of insulative sleeves 30 are
fitted. The outer circumferential face 35 of the insulative sleeve
30 is engaged with the wall of the passage 44. One end face 31 of
each insulative sleeve 30 is disposed with a small diameter section
33 inward extending from the end face 31. The small diameter
section 33 is formed with several slits 36, permitting the small
diameter section 33 to be expanded. A contact member 20 is fitted
between the small diameter sections 33 of the two insulative
sleeves 30. The end face 31 of the insulative sleeve 30 is formed
with a central through hole 32. The small diameter section 33 is
concentric with and extends inward from the peripheral wall of the
central through hole 32. The inner wall of the small diameter
section 33 is disposed with slope face 34, whereby the contact
member 20 can be easily fitted into the small diameter section 33.
In this embodiment, the insulative sleeve 30 has an elongated
structure.
The contact member 20 is punched with at least two rectangular
holes 21 near two ends respectively. One end of the rectangular
hole .21 is connected with the tube body of the contact member 20
to form an inward extending inclined section 22 and arch section
23. The arch section 23 is formed with a fissure 24 for increasing
the contact area with a contact article.
FIGS. 3 and 4 show another embodiment of the present invention,
wherein the insulative sleeve 30a has a short structure and is
located at each end of the passage 44 of the main body 40 without
contacting with each other. According to a test result, the short
structure is able to achieve a better electrical property and
greatly reduce back loss of the electrical appliance.
FIG. 5 shows a third embodiment of the present invention, wherein
the insulative sleeve 30b is made of rubber material and formed
with a central recess 32b on outer end face 31b. The insulative
sleeve 30b is further formed with a coaxial insertion hole 33b for
the contact member 20 to fit therein. An annular projection 35b is
disposed on the outer circumference of the insulative sleeve 30b. A
membrane 34b is disposed between the central recess 32b and the
insertion hole 33b. The annular projection 35b and the membrane 34b
serve to achieve a better waterproof effect for the interior of the
connector and increase the resilience of the contact member 20.
When coupled with the core of the cable, by means of slightly
forcing the cable, the core can pierce the membrane 34b to engage
with the contact member 20.
FIGS. 6, 6A and 6B which show a fourth embodiment, wherein the
contact member 20a is made of a sheet material by means of curling.
Two ends of the contact member 20a are not adjoined together so as
to define a narrow slit 27. The opposite side of the slit 27 is
also formed with two slits 27a which are not adjacent to each
other. This contact member 20a is adapted to a core with a diameter
of over 1.2 mm. When a 1.2 to 1.3 mm core is inserted, by means of
the slits 27, 27a, the contact member 20a can be stretched open to
achieve greater resilience.
Please refer to FIGS. 7A and 7B. When the core 55 is inserted into
the contact member 20 or 20a, the arch sections 23 as well as the
inclined sections 22 are outward stretched open. In the case of a
smaller core, the engagement between the core and the contact
member is as shown in FIG. 7A. In the case of larger core, the
engagement between the core and the contact member is as shown in
FIG. 7B. The bottom of the arch section 23 is disposed with a
V-shaped notch 25 and a fissure 24 so that the inserted core
contacts with the contact member along a line.
The insulative sleeve 30, 30a, 30b of the present invention can be
selectively made of plastic or rubber material to achieve a better
strength and waterproof effect. The suitable dimension of the core
of the cable is within 0.5 to 1.2 mm. (The existing core of the
coaxial cable is within about 0.6 to 1.05 mm.) This is advantageous
over the conventional one. In case the diameter of the insulative
sleeve is enlarged, the same connector is suitable for larger
core,
In FIG. 8, each end of the contact member 20 is punched with three
rectangular holes 21.
According to the above arrangement, the present invention is
advantageous over the conventional device in that;
The ratio of defective product is greatly reduced and the
electrical property is enhanced. In addition, the core contacts
with the contact member along a line or on a face, whereby the back
loss of the electrical appliance is less and the range of the
suitable core is larger (0.5 to 1.3 mm) for greater current to pass
therethrough.
It is to be understood that the above description and drawings are
only used for illustrating one embodiment of the present invention,
not intended to limit the scope thereof. Any variation and
derivation from the above description and drawings should be
included in the scope of the present invention.
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